Mac users eager to try out Firefox 3 Beta 4 without messing with their time-honed Firefox 2 setups can do so with a pretty simple trick. Download the beta, but at the end of the installation process, drag the Firefox icon/application onto your Desktop or another free space instead of the Applications folder. Then rename the file (perhaps something like "firefox 3 test"), and finally place wherever you'd like. Windows users should look to the portable edition for similar risk-free beta-driving.